D defs.my
Entry 1 sense Webster, 1913

Er

· IPA /ɜː/
01 n. the chemical symbol for erbium, a rare earth element. It has atomic number 68 and an atomic weight of 167.26.
  1. 1.
    the chemical symbol for erbium, a rare earth element. It has atomic number 68 and an atomic weight of 167.26. See: erbium
Syn. erbium.